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Re: NullPointerException in EODatabaseContext java
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Re: NullPointerException in EODatabaseContext java

  • Subject: Re: NullPointerException in EODatabaseContext java
  • From: "Cheong Hee (Gmail)" <email@hidden>
  • Date: Fri, 01 Jun 2012 19:05:35 +0800
Hi Raghu
May be you really need to look at how the object model design. Usually, once the invalidate all objects, the ec will fetch again new objects and theirs object graph. May be some code will be helpful. Also, pls remember to have component-based ec. 

Cheers

Cheong Hee
----- Original Message ----- From: "Raghavender Bokka" <email@hidden> 
To: "Cheong Hee (Gmail)" <email@hidden>
Cc: "Development WebObjects" <email@hidden>
Sent: Friday, June 01, 2012 2:17 PM
Subject: Re: NullPointerException in EODatabaseContext java


Hi Cheong Hee,
I tried invalidating the objects in ec, then we are able to view the details of this eo object, but the other similar objects in the wodisplaygroup list is behaving weirdly when they are selected. 

Regards,
Raghu.

On 01-Jun-2012, at 11:41 AM, Cheong Hee (Gmail) wrote:
i guessed one quick way is to invalidate the objects in ec and force it to refetch from db.
----- Original Message ----- From: "Raghavender Bokka" <email@hidden> 
To: "Development WebObjects" <email@hidden>
Sent: Thursday, May 31, 2012 9:04 PM
Subject: NullPointerException in EODatabaseContext java



Hi Team,
I have created an enterprise object with one-to-many relationship objects associating. Then in the search page searched for these enterprise objects (that has WODisplayGroup), I am able to view the newly created object, but when I try to select that object to view the details it is generating the following exception. If I restart the application then I am able to view the details of the newly created object without any error, or If we try accessing the newly created object after sometime (around half an hour later) then without error able to view the object details. Otherwise the enterprise object is getting null.
This enterprise object's super class has the database table, and this object does not has the database table, it points to the same database table of the super class. And the to-many relationship is existing with this enterprise object (sub-class), not the super class. 

Any help would be appreciated.

------------------------EXCEPTION--------------------------------------------------
[2012-5-31 8:25:4 EDT] <WorkerThread7> java.lang.NullPointerException
at com.webobjects.eoaccess.EODatabaseContext.arrayFaultWithSourceGlobalID(EODatabaseContext.java:3510) at com.webobjects.eoaccess.EODatabaseContext._fireDeferredFaultWithSourceObject(EODatabaseContext.java:2377) at com.webobjects.eoaccess.EOAccessDeferredFaultHandler.createFaultForDeferredFault(EOAccessDeferredFaultHandler.java:49) at com.webobjects.eocontrol.EOCustomObject.willReadRelationship(EOCustomObject.java:1279) at com.webobjects.eocontrol._EOMutableKnownKeyDictionary$Initializer$_LazyGenericRecordBinding.valueInObject(_EOMutableKnownKeyDictionary.java:614) at com.webobjects.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:1634) 
      at _StoredDistrictTest.storedTestItems(_StoredDistrictTest.java:33)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
      at java.lang.reflect.Method.invoke(Method.java:597)
at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60) at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134) at com.webobjects.eocontrol.EOCustomObject.valueForKey(EOCustomObject.java:1498) at com.webobjects.eocontrol.EOCustomObject.eoDescription(EOCustomObject.java:793) at com.webobjects.eocontrol.EOCustomObject.toString(EOCustomObject.java:299) 
      at java.lang.String.valueOf(String.java:2826)
      at java.lang.StringBuilder.append(StringBuilder.java:115)
      at StoredTestListPage.printTestSession(StoredTestListPage.java:276)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
      at java.lang.reflect.Method.invoke(Method.java:597)
at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60) at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134) at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324) at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736) at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447) at com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212) at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804) at com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50) at com.webobjects.appserver._private.WOHyperlink.invokeAction(WOHyperlink.java:98) at er.extensions.components._private.ERXHyperlink.invokeAction(ERXHyperlink.java:66) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at er.extensions.components._private.ERXWORepetition.invokeAction(ERXWORepetition.java:496) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at er.extensions.components._private.ERXWOForm.invokeAction(ERXWOForm.java:219) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOComponentContent.invokeAction(WOComponentContent.java:38) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver._private.WOHTMLURLValuedElement.invokeAction(WOHTMLURLValuedElement.java:149) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079) at er.extensions.components.ERXComponent.invokeAction(ERXComponent.java:102) at com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:127) at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105) at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115) at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079) at er.extensions.components.ERXComponent.invokeAction(ERXComponent.java:102) at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357) 
      at Session.invokeAction(Session.java:179)
at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745) at er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:93) at er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1869) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:206) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298) at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332) at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369) at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442) at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687) at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1984) at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1949) 
      at Application.dispatchRequest(Application.java:742)
at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144) at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226) 
      at java.lang.Thread.run(Thread.java:619)
-------------------- Regards, 
Raghu.



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